A system and method is provided for detecting, tracking and/or blocking control signal attacks, which can occur between local computer systems and/or between remote computer systems, network links, and/or routing systems over a computer network. The system includes a router monitor adapted to receive a plurality of control signals and related information from the computer network and to process the plurality of control signals and related information to detect one or more control signal anomalies. The router monitor is further adapted to generate a plurality of alert signals representing the one or more control signal anomalies. The system further includes a controller that is coupled to the router monitor and is adapted to receive the plurality of alert signals from the router monitor. The controller is constructed and arranged to respond to the plurality of alert signals by tracking attributes related to the one or more control signal anomalies to at least one source, and to block the one or more control signal anomalies using a filtering mechanism executed in close proximity to the at least one source.